Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: qual é a média de comparecimento por jogo onde a elevação é de 1500 m?
 ###Tabelas: CREATE TABLE current_stations (current_stations_id AUTO_INCREMENT PRIMARY KEY, Station VARCHAR, Metlink code VARCHAR, Line(s) VARCHAR, Service(s) VARCHAR, Serves VARCHAR, km from Wellington VARCHAR, Fare zone(s) VARCHAR, Opened VARCHAR) CREATE TABLE stations_under_construction (stations_under_construction_id AUTO_INCREMENT PRIMARY KEY, Station VARCHAR, Extension VARCHAR, City/Neighborhood VARCHAR, Projected opening INT, Transit Connections VARCHAR, Park and ride? VARCHAR) CREATE TABLE five_cent_test_tokens (five_cent_test_tokens_id AUTO_INCREMENT PRIMARY KEY, Year of Issue INT, Description VARCHAR, Weight VARCHAR, Diameter VARCHAR, Thickness VARCHAR, Edge VARCHAR) CREATE TABLE singles:_7_4_titles_3_runner-ups (singles:_7_4_titles_3_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date (Final) VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score VARCHAR) CREATE TABLE stadiums (stadiums_id AUTO_INCREMENT PRIMARY KEY, Stadium VARCHAR, City VARCHAR, Capacity INT, Matches played INT, Overall attendance INT, Average attendance per match INT, Average attendance as % of Capacity VARCHAR, Overall goals scored INT, Average goals scored per match VARCHAR, Elevation VARCHAR)  
SELECT Average attendance per match FROM stadiums WHERE Elevation = 1500 m